World Wide Telescope mining the Sky using Web Services Information At Your Fingertips for astronomers. Jim Gray Microsoft Research Alex Szalay Johns Hopkins University.
World Wide Telescopemining the Skyusing Web ServicesInformation At Your Fingertips for astronomers
Jim Gray Microsoft Research
Alex Szalay Johns Hopkins University
How to build the World Wide Telescope?Web Services & Grid Enable Virtual Observatoryhttp://www.astro.caltech.edu/nvoconf/http://www.voforum.org/
Q11: Find all elliptical galaxies with spectra that have an anomalous emission line.
Q12: Create a grided count of galaxies with u-g>1 and r<21.5 over 60<declination<70, and 200<right ascension<210, on a grid of 2’, and create a map of masks over the same grid.
Q13: Create a count of galaxies for each of the HTM triangles which satisfy a certain color cut, like 0.7u-0.5g-0.2i<1.25 && r<21.75, output it in a form adequate for visualization.
Q14: Find stars with multiple measurements and have magnitude variations >0.1. Scan for stars that have a secondary object (observed at a different time) and compare their magnitudes.
Q15: Provide a list of moving objects consistent with an asteroid.
Q16: Find all objects similar to the colors of a quasar at 5.5<redshift<6.5.
Q17: Find binary stars where at least one of them has the colors of a white dwarf.
Q18: Find all objects within 30 arcseconds of one another that have very similar colors: that is where the color ratios u-g, g-r, r-I are less than 0.05m.
Q19: Find quasars with a broad absorption line in their spectra and at least one galaxy within 10 arcseconds. Return both the quasars and the galaxies.
Q20: For each galaxy in the BCG data set (brightest color galaxy), in 160<right ascension<170, -25<declination<35 count of galaxies within 30"of it that have a photoz within 0.05 of that galaxy.
Q1: Find all galaxies without unsaturated pixels within 1' of a given point of ra=75.327, dec=21.023
Q2: Find all galaxies with blue surface brightness between and 23 and 25 mag per square arcseconds, and -10<super galactic latitude (sgb) <10, and declination less than zero.
Q3: Find all galaxies brighter than magnitude 22, where the local extinction is >0.75.
Q4: Find galaxies with an isophotal surface brightness (SB) larger than 24 in the red band, with an ellipticity>0.5, and with the major axis of the ellipse having a declination of between 30” and 60”arc seconds.
Q5: Find all galaxies with a deVaucouleours profile (r¼ falloff of intensity on disk) and the photometric colors consistent with an elliptical galaxy. The deVaucouleours profile
Q6: Find galaxies that are blended with a star, output the deblended galaxy magnitudes.
Q7: Provide a list of star-like objects that are 1% rare.
Q8: Find all objects with unclassified spectra.
Q9: Find quasars with a line width >2000 km/s and 2.5<redshift<2.7.
Q10: Find galaxies with spectra that have an equivalent width in Ha >40Å (Ha is the main hydrogen spectral line.)
50K Spectra with ~30 lines/
~1,000 IO/cpu sec ~ 64 MB IO/cpu sec
Selectcast((u-g) as int) as ug,
cast((g-r) as int) as gr,
cast((r-i) as int) as ri,
cast((i-z) as int) as iz,
count(*) as Population
group bycast((u-g) as int), cast((g-r) as int),
cast((r-i) as int), cast((i-z) as int)
order by count(*)
selectobjId, dbo.fGetUrlEq(ra,dec) as url --return object ID & url
sqrt(power(rowv,2)+power(colv,2)) as velocity
fromphotoObj -- check each object.
where (power(rowv,2) + power(colv, 2)) -- square of velocity
between 50 and 1000 -- huge values =error